Key recorded four tackles (three solo), including one sack, and forced a fumble in Sunday's loss to Seattle.
Key recorded two total tackles (both solo), including one tackle for loss and one sack in Monday night's 28-27 win over the Titans.
The Jaguars signed Key to a one-year, $7 million contract Wednesday.
Key (head) has returned to Sunday's NFC Championship Game against the Rams, Matt Barrows of The Athletic reports.
Key is being evaluated for a head injury during Sunday's NFC Championship Game against the Rams.
Key tallied a sack across his 24 snaps on defense Sunday in the 49ers' 31-13 win over the Falcons.
The 49ers signed Key to a one-year contract Wednesday, Ian Rapoport of NFL Network reports.
The Raiders waived Key on Thursday, Ian Rapoport of NFL Network reports.
Key (undisclosed) was activated from the reserve/COVID-19 list Saturday, Paul Gutierrez of ESPN.com reports.
The Raiders placed Key on the reserve/COVID-19 list Wednesday, Paul Gutierrez of ESPN reports.